Not square X and Y may cause additional tension on Y-axis, which will lead to vertical skewing along Y. Print calibration cube and measure diagonals in the XY plane. If it is a case you need to play with each belt tension to square XY.by piper3d - CoreXY Machines
I am measuring outer diameter of pulley with belt making it "actual" measurement not a "theoretical" calculation . 13.5mm is actual outer diameter of my 20 teeth motor pulley with 10mm gt2 belt on a live 3d printer.by piper3d - CoreXY Machines
@MadsRC very simple way of finding the distance between the idler and motor pulley: wrap a gt2 belt around your motor pulley and measure outer diameter with the belt for me it is 13.5mm, measure the diameter of the toothless idler for me it is 11.9mm. (13.5+11.9)/2=12.7mmby piper3d - CoreXY Machines
QuoteNewPerfection but skewing in the prints was a big problem Skewing is regulated by belts tension in coreXY. To square my gantry I am moving X carriage to the front and tension belts so distance from Y crriages on the left and right sides to mounts holding pooleys is the same (my system is simmetrical and Y carriages are touching rod holders in this position) QuoteNewPerfection I have enoughby piper3d - CoreXY Machines
I should add that calibration cube pressision is not only function of X-Y alignment but also a function of how well Z and extruder are calibrated. Thickeness of the layer depends on Z calibration and extruder calibration. With 0.4mm layer width it is easy to have 0.2-0.3mm discrepancy in resulting print. So printing larger object like 500x500mm will give more precise answer. I do agree with the_dby piper3d - CoreXY Machines
1.2 mm apart if I understood you question correctly. Belt is 1.2mm thick.by piper3d - CoreXY Machines
Did you think of adding the same mechanism along Z-X plane and remove rods completely?by piper3d - CoreXY Machines
QuotecharlieRC I know that it will be slower than a belt driven printer (about a forth of the distance per revolution) Charlie To go faster and longer on one motor step I would turn down microstepping from 1/32 to 1/8 you should presumably get better torque as well.by piper3d - General
The very short video with Piper 2 printing at World Maker Fair: youtubeby piper3d - CoreXY Machines
Check M24 in Marlin with POWER_LOSS_RECOVERY http://marlinfw.org/docs/gcode/M024.html. I did not play with it yet but planning. Also looks like it is too late for you to enable it .by piper3d - General
Large format 600x450x400 (24''x18''x16'') or 4 CF version of Piper 2 is up and running. It was presented at World Maker Fair last weekend. I was asking people to shake the printer and most of them had been confused seeing that the table was shaking, but the printer was keeping its integrity. One of the visitors guessed that printer was bolted to the table - it was not Another has shaken is soby piper3d - CoreXY Machines
I do not think Snappy may have heated bed. If you have been looking at MPCNC and if you are on a budget check Piper 1 or 2. I did build MPCNC myself and made Pipers project while being inspired by it. But then yes Ryan (the men behind MPCNC) has his own printer also. Piper 1 is at https://www.thingiverse.com/thing:2966295 and Piper 2 is https://www.thingiverse.com/thing:3022836 In 1 week we wiby piper3d - General
Arches are already broken into segments in stl. So when slicer deals with arch it already deals with a Cartesian model of arch broken into straight lines. At this point, there will be a need for approximation of straight lines into arches.by piper3d - General
Very nice machine. You could add a "tool changer" or a "ball changer" so you may draw with different ball sizes or make "wiping tool" a cylinder rolling from one side to another to wipe picture.by piper3d - CoreXY Machines
This is a very nice looking design. Congratulations on fixing your problem. Few notes: - On X you are not using X rods to fight belt tension so Y rods are getting bend force to fight belts. You may engage X rods to resist bending forces. - Location of the X endstop may be changed to increase X printable room. Now you are subtracting the size of endstop sensor from X dimension. - Belt tensioningby piper3d - CoreXY Machines
Quoteo_lampe How much does the gantry-belt tension bent the vertikal pipes inward at half_height? The load from belt tension goes on rods and gantry pipes. I do not see any bending of Z pipes.by piper3d - CoreXY Machines
Piper 1 is going to The World Maker Fairby piper3d - General New Machines Topics
Making a 600x450x400 Piper 2. Uses 12mm rods and 10mm GT2 belts.by piper3d - CoreXY Machines
You can make a cube out of "slotted angle" and it should not look like a crap it should look like lego. You will be fighting twisting forces so.by piper3d - General
Changing filament may sometimes be a problem I've been using AJGW (Alan Jonas) version initially until made my own: https://www.thingiverse.com/thing:2919516 Fusion file is also included. I am making hobs myself using this guide: https://www.thingiverse.com/thing:3073001by piper3d - General
Quoteprot0typ1cal Yea, it's called coreXYU Just checked coreXYUby piper3d - CoreXY Machines
Try printing at 50% speed if it prints fine you need to lower acceleration (most likely it is travel acceleration) - motor is skipping due to high acceleration values. If it still shifts layers you have to lower your extrusion - excess of filament creates obstacles for your nozzle.by piper3d - General
When I was converting from 3 to 1.75 I just printed an additional GW extruder for 1.75. Since that time (about 1 year ago) I am using just GW extruders on all 6 of my printers in different configurations direct drive and Bowden.by piper3d - General
Quoteruyvieira It's not a corexy however, it's a stacked cartesian or whatever it's called like BCN Sigma But it should be easy to implement it in coreXY.by piper3d - CoreXY Machines
Design files for Piper 1 v2 have been released at https://www.thingiverse.com/thing:2966295by piper3d - General New Machines Topics
Most likely it is not Marlin but your hardware. Your bed is cooling faster than it may heat up. Place a piece of paper (letter size or A4) on top of your bed and try heating it up, if I am correct it will go above 71C.by piper3d - General
Quotemokush - can this board hande 2 Z motors (I assume yes, Z and E1 configured to Z2 in the FW)? Or you may connect your Zs in parallel or in series to Z or use CNC shield to connect both to separate drivers. Quotemokush - can this board handle 2 Zmin endstops? Is it possible to configure one of the free endstop connectors as Z2min? Yes the second Zmin is called "Zmax" or "Xmax" just configureby piper3d - General
I am guessing that your problem is that you use 3mm filament in 1.75mm extruder. If this is the case you need to find 1.75 mm filament. may be some components of the extruder like heatbreak or nozzle are 1.75mm.by piper3d - General
Quotethe_digital_dentist Extrusion. Agree. On speeds 200 mm/s and up your limiting factor is volumetric extrusion speed or ability to melt plastic fast enough. And you may get to 300 mm/s and above on 20 teeth pulleys (verified).by piper3d - General
Did you heat up extruder above 170C before testing it? #define PREVENT_COLD_EXTRUSION #define EXTRUDE_MINTEMP 170by piper3d - General