pantograph 3d printer hello folk's I've got this idea since a couple of weeks. see pictures. it's just a model. lot to do before it works. but it seems interesting. [attachment 108184 sketch.png] [attachment 108176 Capturedcran_2018-11-20_21-11-35.png]+ [attachment 108181 Aplan.png][attachment 108182 Bplan.png][attachment 108183 Cplan.png] [attachment 108180 planD.jpg] https://reprap.org/forum/read.php?152,839120,839120#msg-839120 Thu, 14 May 2026 06:52:42 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?152,839120,854079#msg-854079 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,854079#msg-854079
for the angular movement, we could use a ball bearing like in a record player... like this:

[attachment 111554 shaftWell.png]

but you see the majority of the weight is on the ball and the circular shaft surface must be precisely fit with the well.

but we can do in another way..

if we use magnets, we can do this

[attachment 111555 upsideDown.png]

it's a ball bearing too but the shaft is balanced with magnetic forces (not mecanic)

(this is the same kind of thing in rotary movement used for this tonearm describe here:
https://reprap.org/forum/read.php?166,854080
)




here is a functional model:

[attachment 111556 nearingB.png]

[attachment 111557 nearingC.png]

the scad and stl files:

https://www.dropbox.com/s/nt7yjlvgph8g0gu/bearingUD.tar.gz?dl=0

video:

https://www.dropbox.com/s/9tlps6j05ontl5g/bearing.mp4?dl=0]]> herve robert General New Machines Topics Mon, 27 May 2019 01:38:37 -0400 https://reprap.org/forum/read.php?152,839120,842812#msg-842812 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,842812#msg-842812
Some designs were proposed to make Z Axis linear.
Don't know if anybody implemented them?

Inventor went on to better designs!

:S]]> cozmicray General New Machines Topics Sat, 29 Dec 2018 13:48:17 -0500 https://reprap.org/forum/read.php?152,839120,842780#msg-842780 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,842780#msg-842780
Quote
herve robert


@MKSA

lucky you are if you have the paul graham's mood...

http://mediation.centrepompidou.fr/education/ressources/ENS-Duchamp/popup02.html

Not at all the same as Arthur Ganson ! His creations are really "working" and based on gears, belts, chain, even oil viscosity ....]]> MKSA General New Machines Topics Sat, 29 Dec 2018 11:13:19 -0500 https://reprap.org/forum/read.php?152,839120,842726#msg-842726 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,842726#msg-842726
that's the point. I suppose an appropriate spiral shape for each angle (θ, φ, t)... cancel tracking error.

in the case above spiratic shape: smallest diameter 10 cm / biggest diameter 12 cm, tape 30 microns and motor shaft diameter 5 mm = constant ratio 20 ( vs cylinder with 10 cm "constant" diameter = ratio between 16 - 20)


@MKSA

lucky you are if you have the paul graham's mood...

http://mediation.centrepompidou.fr/education/ressources/ENS-Duchamp/popup02.html]]> herve robert General New Machines Topics Sat, 29 Dec 2018 03:16:40 -0500 https://reprap.org/forum/read.php?152,839120,842445#msg-842445 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,842445#msg-842445
BUT you should try "Gestural Engineering" ! Artist Arthur Ganson
Last spring in Boston, I visited the MIT museum and really it is a kind of art I like. Worth the visit !

[mitmuseum.mit.edu]]]> MKSA General New Machines Topics Thu, 27 Dec 2018 03:50:14 -0500 https://reprap.org/forum/read.php?152,839120,842440#msg-842440 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,842440#msg-842440 You'll have to take countermeasures like nonlinear kinematics or increase the diameter of the bed accordingly.]]> o_lampe General New Machines Topics Thu, 27 Dec 2018 02:30:00 -0500 https://reprap.org/forum/read.php?152,839120,842380#msg-842380 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,842380#msg-842380
Quote
MechaBits
re purpose the rotating base from this [www.thingiverse.com]

interesting
you've 10 teethes gear and a 100 teethes gear ==> 10 ratio.

with tape I hope an higher ratio ==> 16 or 20 or higher..

and maybe for the z axis, this design:

[attachment 108942 zAxis.png]]]> herve robert General New Machines Topics Wed, 26 Dec 2018 05:39:32 -0500 https://reprap.org/forum/read.php?152,839120,842268#msg-842268 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,842268#msg-842268 www.thingiverse.com]]]> MechaBits General New Machines Topics Mon, 24 Dec 2018 06:25:27 -0500 https://reprap.org/forum/read.php?152,839120,842130#msg-842130 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,842130#msg-842130


[attachment 108876 schematic.png]




work not so bad.. see video too. video





[attachment 108877 faceA.png]
[attachment 108878 faceB.png]
[attachment 108879 faceC.png]
[attachment 108880 faceD.png]]]> herve robert General New Machines Topics Sat, 22 Dec 2018 04:44:02 -0500 https://reprap.org/forum/read.php?152,839120,840735#msg-840735 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,840735#msg-840735
Quote
cozmicray
On wally a movable pulley on bed was no problem to lift bed
When motor turned OFF -- stage fell to bottom --- really need stepper with brake

Correcting arc to linear NOT trivial in slicer code or post processor

Here is python code by Nick Seward (inventor of wally) to correct arc in Z motion

[attachment 108504 wallysegmentize.py]

Good Luck

:S

Is the Wally failure due to bad luck ?]]> MKSA General New Machines Topics Sat, 08 Dec 2018 11:02:50 -0500 https://reprap.org/forum/read.php?152,839120,840708#msg-840708 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,840708#msg-840708
thank you for the code
I will look closer to the work of Nick Seward



I want to try this too
it s more about the extruder so I made a another topic.
Dual drive extruder]]> herve robert General New Machines Topics Sat, 08 Dec 2018 07:10:37 -0500 https://reprap.org/forum/read.php?152,839120,840679#msg-840679 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,840679#msg-840679 When motor turned OFF -- stage fell to bottom --- really need stepper with brake

Correcting arc to linear NOT trivial in slicer code or post processor

Here is python code by Nick Seward (inventor of wally) to correct arc in Z motion

[attachment 108504 wallysegmentize.py]

Good Luck

:S]]> cozmicray General New Machines Topics Fri, 07 Dec 2018 17:45:55 -0500 https://reprap.org/forum/read.php?152,839120,840480#msg-840480 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,840480#msg-840480
I didn't know the wally printer concept

as far as I understand, it seems that the bed elevation is not balanced ...


yes, probably need some code tweaks to had the right print head movements.


about the use of belt.. maybe... strings or ribbon... with weight for backward movements of θ, t .

not quite totaly sure...

[attachment 108453 weight.png]]]> herve robert General New Machines Topics Wed, 05 Dec 2018 13:30:24 -0500 https://reprap.org/forum/read.php?152,839120,840405#msg-840405 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,840405#msg-840405 ? Slicer post processing to correct ?

Wally 3D printer used a parallel arm to move table

[reprap.org]

[archive.fabacademy.org]

Wally really never worked
I have one sitting on a shelf gathering dust!

:S]]> cozmicray General New Machines Topics Tue, 04 Dec 2018 13:36:32 -0500 https://reprap.org/forum/read.php?152,839120,840228#msg-840228 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,840228#msg-840228 Number_5 General New Machines Topics Sun, 02 Dec 2018 16:14:39 -0500 https://reprap.org/forum/read.php?152,839120,840209#msg-840209 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,840209#msg-840209
not very easy to drive the filament in the heater

and today I made this
sample of gears to drive the turntable.

the motor as a counterweight is a good idea too :)-D

[attachment 108403 gear.png]]]> herve robert General New Machines Topics Sun, 02 Dec 2018 13:39:28 -0500 https://reprap.org/forum/read.php?152,839120,840154#msg-840154 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,840154#msg-840154 Shop for 4WD RC-car-spareparts, you'll sure find plenty.

BTW: Why not use the extruder-motor as counterweight?]]> o_lampe General New Machines Topics Sun, 02 Dec 2018 03:24:39 -0500 https://reprap.org/forum/read.php?152,839120,840132#msg-840132 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,840132#msg-840132
[attachment 108379 plan.png]
[attachment 108377 arm.png]

[attachment 108378 arm2.png]]]> herve robert General New Machines Topics Sat, 01 Dec 2018 12:19:17 -0500 https://reprap.org/forum/read.php?152,839120,839688#msg-839688 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,839688#msg-839688 it's not easy to print near to the center of rotation.
if you move in the Y-direction, you have to move the turntable mecanism too or the pantograph.
but look a this (it's only hypothetical):


[attachment 108303 top.png]

but the main idea is the pantograph.

one point is to built a direct drive (instead of the bowden system) but without an overload

the filament drive motor is not at the end of the cantilever but centered on the main axis

[attachment 108301 canti.png]

another point is to use a dual-shaft motor to drive each side of the pantograph up and down

[attachment 108302 dual.png]]]> herve robert General New Machines Topics Mon, 26 Nov 2018 11:41:33 -0500 https://reprap.org/forum/read.php?152,839120,839585#msg-839585 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,839585#msg-839585 Otherwise you'll have limited movement when the printhead is closer to it's center of rotation. (eg. at low and high Z-coords)]]> o_lampe General New Machines Topics Sun, 25 Nov 2018 03:00:30 -0500 https://reprap.org/forum/read.php?152,839120,839439#msg-839439 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,839439#msg-839439 reprap.org],

"....- easy to built
- bargain price but good quality too
...."
?]]> MKSA General New Machines Topics Fri, 23 Nov 2018 08:11:44 -0500 https://reprap.org/forum/read.php?152,839120,839405#msg-839405 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,839405#msg-839405 MechaBits General New Machines Topics Thu, 22 Nov 2018 23:34:24 -0500 https://reprap.org/forum/read.php?152,839120,839235#msg-839235 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,839235#msg-839235 Number_5 General New Machines Topics Wed, 21 Nov 2018 15:19:19 -0500 https://reprap.org/forum/read.php?152,839120,839207#msg-839207 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,839207#msg-839207
some features "expected".

- balanced-arm with a counterweight
- least amount of parts, no or no long belts, no rods, ..
- majority of printed (or cnc) parts
- easy to built
- bargain price but good quality too
- (θ,t) simple bearing like in record player turntable
- small printing size (about pantograph, I'm worried about the size of he arm. if it's too long, it could be wagging (and so poor accuracy).

maybe it's not a good design and it'll never work but someone could have a better idea... who knows ?

[attachment 108197 arm.png]
[attachment 108198 abc.png]]]> herve robert General New Machines Topics Wed, 21 Nov 2018 12:10:36 -0500 https://reprap.org/forum/read.php?152,839120,839194#msg-839194 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,839194#msg-839194
It looks like a lot to deal with in slicing due to all the tangents, but you must already have that part sorted.

Neat design.]]> Number_5 General New Machines Topics Wed, 21 Nov 2018 09:07:30 -0500 https://reprap.org/forum/read.php?152,839120,839145#msg-839145 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,839145#msg-839145
videoA

videoB


it's not exactly like R360 printer.


you've got a turntable too but there are three angular movements (θ, φ, t).

(r360 have two linear movements X,Z and a angular movement)]]> herve robert General New Machines Topics Wed, 21 Nov 2018 01:56:32 -0500 https://reprap.org/forum/read.php?152,839120,839136#msg-839136 Re: pantograph 3d printer https://reprap.org/forum/read.php?152,839120,839136#msg-839136
eg like the R360 [reprap.org]

I note the video likes are broken so ill repost them here..
[www.youtube.com]
[www.youtube.com]]]> Dust General New Machines Topics Tue, 20 Nov 2018 21:18:26 -0500 https://reprap.org/forum/read.php?152,839120,839120#msg-839120 pantograph 3d printer https://reprap.org/forum/read.php?152,839120,839120#msg-839120
I've got this idea since a couple of weeks.

see pictures.

it's just a model.

lot to do before it works. but it seems interesting.

[attachment 108184 sketch.png]
[attachment 108176 Capturedcran_2018-11-20_21-11-35.png]+
[attachment 108181 Aplan.png][attachment 108182 Bplan.png][attachment 108183 Cplan.png]

[attachment 108180 planD.jpg]]]> herve robert General New Machines Topics Tue, 20 Nov 2018 15:39:38 -0500