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Hello all!
I'm building a custom toolchanger with e3d toolhead and toolplates, and I was having problems with fans not reacting to PWM or being very whinny/loud/weak as soon as I PWM'd them, so I'm designing a very simple circuit with an low pass configured opamp and a transistor that should give a nice and stable analog voltage from the PWM signal from the duet.
Since I'm lowpass filtering in s
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EgonVLC
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Developers
Hi everyone!
After a long design phase, with several restart-again moments, I got my CoreXY motion stage design finished. I draw a lot of inspiration everywhere, but my main sources where UMMD by our Doctor Mark Rehost, and the E3D Toolchanger.
Main design goals where:
- Simple, but sturdy, metal mounts whereever possible
- Linear rail motion. I've tested wheels on V-Slot, linear rods and line
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EgonVLC
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CoreXY Machines
Make sure the wires are in the correct order, that kind of behaviour maybe because of it.
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EgonVLC
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CoreXY Machines
Hola a todos y saludos desde Valencia!
Estoy diseñando mi segunda impresora completamente DIY (ya hice una cartesiana estilo prusa) esta vez CoreXY, con opción a usar el toolchanger de E3D. Estoy acabando ya el diseño, pero me preguntaba si alguien de por aquí estaría interesado en colaborar tanto a nivel de diseño, como de construcción... ¿A alguien le motiva?
Un saludo!
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EgonVLC
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RepRap en Español
Hi everyone! I've just finished my corexy design, and I'd need some pieces to be cnc'ed. I'm heading to one of the Aliexpress cnc services because there's nothing local where I live. Does anyone have tried that kind of service before? Any recommendations?
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EgonVLC
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Mechanics
QuoteErnest1122
QuoteEgonVLC
I'm from Eurpe (Spain), and language is indeed a problem, as shipping cost also is. And makerspaces here are almost non-existent, so access to custom metal pieces is kind of difficult.
try aliexpress.com, this is multi-language site for non-chinese ppl. although not all, but many taobao stores are also in aliexpress.com too.
however i think there are definitely loca
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EgonVLC
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CoreXY Machines
QuoteErnest1122
QuoteEgonVLC
Could you please share the link of the cutting service?
it's one of the tens of matel processing shops in taobao.com. i havent use it, i mentioed it just based on the price they offered.
taobao is china's ebay. chinese ppl do all 2b or 2c business online. i mean ALL. western ppl usually use aliexpress because of language. i live in taiwan so easier for me to access
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EgonVLC
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CoreXY Machines
QuoteErnest1122
china laser cutting shop qouted me less than 30usd for my two 3mm 304 steel y plates.
Could you please share the link of the cutting service?
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EgonVLC
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CoreXY Machines
Quotephaedrux
If you're really concerned about belts, do some research on the gates belts and how they are used in industrial applications. You'll quickly see that the 6mm belts are more than adequate for even the most demanding 3D printing. They are the most appropriate choice. Wider isn't necessarily better. It's the application requirements that dictates the appropriate belt spec. Go with 6mm.
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EgonVLC
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CoreXY Machines
QuoteMKSA
On a Prusa as the bed moves, one major cause is the stupid way the bed is mounted on 4 springs !
Mine is on a kinematic mount. No spring and most of the ringing is gone.
Indeed... I have my springs real tight, but always thought that the springs themselves were not a good idea when you have to move the bed.
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EgonVLC
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CoreXY Machines
QuoteMKSA
On a Prusa as the bed moves, one major cause is the stupid way the bed is mounted on 4 springs !
Things I already learn with my current setup:
- DO NOT move the bed back and forth --> That's why I wanted to try CoreXY, but I fear the looong belts
- DO NOT use 4 screws for bed leveling --> Why on earth they use 4 in the original design? I mean, you can do a Prusa-style with 3 scr
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EgonVLC
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CoreXY Machines
Comparing prices, from E3D store,
Gates (fiber reinforced) belt is, each 100mm long:
6mm -> 0.82€
9mm -> 1.24€
12mm -> 1.64€
Regarding pulleys, a tipical 20 tooth gates-compatible pulley is:
6mm -> 5.79€
9mm -> 6.16€
12mm -> 6.56€
Idlers (smooth):
6mm -> 7.52€
9mm -> 7.80€
12mm -> 7.93€
Idlers (toothed):
6mm -> 7.93€
9mm -> 7.39€
12mm -> 7.
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EgonVLC
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CoreXY Machines
E3D (and many others) sells Gates belt/pulleys in several sizes: typical 6mm, 9mm and 12mm, among others. As I undesrtand, the wider the belt, the less the (belt-induced) ghosting. ¿Is there any downside to go all the way up with 12mm belts/pulleys?
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EgonVLC
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CoreXY Machines
Quotethe_digital_dentist
How would you make a noncantilevered bed using only one lead screw to lift it?
Using two lead screws on opposite sides of the bed would also be cantilevered, but the length of the cantilever would be shorter.
So the cantilever concept is about the flexibility of the bed structure itself? If overconstraining movement wasn't a problem, and in an ideal word with perfect li
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EgonVLC
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CoreXY Machines
Quotepatnap71
Check these out...
IMHO, the first link also has the belts wrongly set, belts that should be paralel to movement are not...
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EgonVLC
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CoreXY Machines
My design intent has two guides and two leadscrews, but I've had problems in the past with pulleys not perfectly concentric in leadscrews and leadscrew bending due to belt tension. That's why I tought about a single leadscrew.
Having a second thought, if I mount the motor centered under the bed, with the leadscrew "looking down", I could use just that one, but the printer height should acomodate
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EgonVLC
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CoreXY Machines
Has anyone come with a non-cantilevered single leadscrew bed, or is it mandatory to have two leadscrews for non-cantilevered constructions? I'd really like to have a single motor - single leadscrew bed mechanism, but I can't think of a way of doing it without inherent flaws.
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EgonVLC
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CoreXY Machines
By the way, what do you thing about this as a bed? It's supposed to be milled flat cast aluminium, but I think is too cheap...
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EgonVLC
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CoreXY Machines
Given that my current working machine is not an optimum design (4 screws bed + two motors with leadscrews, Tarantula inheritance...) and I hardly have to relevel it, I want to do it "as right as posible" and forget releveling, so the 2 linear guides + 2 screws is the best choice for me IMHO.
My only left question is about leadscrews and belts. Every single time I've tried to do a leadscrew + be
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EgonVLC
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CoreXY Machines
Quotethe_digital_dentist
One screw located far from the linear guides might be a problem because the spacing between the screw and the bearing blocks acts as a lever to tilt the bed. That will cause the bed to rock on the bearing blocks as the bed moves up and down. Lifting should be done as close to the bearing blocks as possible. If you want to use one motor only, use two screws located next
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EgonVLC
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CoreXY Machines
Something like this (it's a very early work in progress, just a draft)
EDIT: 3030/3060 aluminium extrusion main frame and 2020/2040 aluminium extrusion bed support
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EgonVLC
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CoreXY Machines
First of all, let me introduce myself, as this is my very first post here! I'm an electrical engineer and software engineer from Spain, but I really like all kind of tecnical challenges. My 3D printing adventures began almost 2 years ago, with a Tevo Tarantula (I said I like challenges, didn't I...?). It kind of printed ok-ish after assembly, but it had an awful lot of limitations. As any unexper
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EgonVLC
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CoreXY Machines