2D Delta Drawbot

thingiverse

This is a set of files to make the 3D printed parts of a 2D "delta" kinematic drawbot. It will need a few extras: most bolts are M3, you'll need a selection of bolts and some nuts with some grubscrews in the same size, as well as M8 shoulder bolts. You'll also require small bearings for elbows and wrists (four each) with 3mm centers, large skateboard bearings for the shoulder joints (total of four) with 8mm centers, a timing belt (T2.5 I think), NEMA17 stepper motors, a stepper controller board - my code is designed to use the Eggbot EiBotBoard, six millimeter carbon rod, about one meter total for each arm but this depends on how big you want the machine, and a pen lift servo that's a standard micro servo. Pulleys on the stepper motors are taken directly from droftarts' excellent pulley library, while the arm pulleys are modified from the library so I've marked this whole thing as a remix. Print Settings Printer: Mini Kossel Supports: No Resolution: Probably around 0.2mm is best Infill: What you like, twenty percent or denser probably Post-Printing Holes, fittings and assembly will require holes to be reamed to two point five millimeters and tapped M3. You'll probably need to ream the rod holes to six millimeters to fit the carbon rods in. Nut slots should be okay to just drop M3 nuts in but depending on your print settings they might be tight. You shouldn't need support material for any parts. The servo horn may need modifications to fit the pen linkage, I had to bolt mine in place with very small bolts but epoxy might work for you. How I Designed This CAD: All parts were created in OpenSCAD, some parts have extruded DXF files created in Inkscape which should be included. The code is not very nice so don't laugh at it. The drawbot is run from a very rough Processing sketch that interfaces with the EiBotBoard via USB. It will draw SVG files from Inkscape. It uses the geomerative library for Processing for SVG reading which doesn't seem to work in recent versions of Processing, I use Processing 2.1.2(32bit) on Windows which you should be able to download.