Enclosed in this file is the parts, instructions, and schematics to build a leadscrew based delta printer known as the rep-rap Luria. This printer utilizes 3D printed parts and joints that hold a hand-cut 1/2 inch thick plywood frame together. This printer is still a work in progress, so improvements and file changes will most likely change before I am finished.
Specs (as of now):
200mm diameter build volume
100mm build height
~500mm sq. overall footprint
===========IMPORTANT: scale all items by 25 to make them correctly sized=========
Infill and print settings for most of the parts can be standard, but some of the more stressed pieces could be printed at higher infill.
keep in mind that I am still finishing this machine as well, and these things may change.
Here I Will be posting updates on my own developing progress of this printer:
Monday, March 26
2 days after MRRF 2018, fixed motor voltage issue with use of microstepping jumpers. Modified carriage pieces to be sturdier and to have adjustable end stops.
Tues-Thursday March 29
programmed the majority of the printer, making it travel flatly and true to the build surface.
Friday March 30,
swapped RAMPS board with RUMBA board and added monitor, Finished basic programming.
Saturday, March 31,
Printed first test cube. Good for first print, but has very apparent Z wobble due to lead screws and 2 point carriages.
Sunday, April 1, Easter
Debating what type of solution can be used to solve this issue. Proposing adding a 2nd set of guide rods to the printer perpendicular to the existing ones.
Monday, April 2,
confirmed addition of 2nd set of linear rods and also confirmed the addition of a Z leveling Probe for easier and more consistent calibration.
Saturday, April 6
added the 2nd set of z rods and the z probe using a redesigned effector. Z wobble and effector play significantly reduced.
Sunday, April 7
Can say that this printer is pretty much finished (there will still be plenty of fine tuning). Getting decently good prints from the machine. Will be compiling the total cost of materials soon.
This printer was designed In mind not to have the most printed parts, but to be the most simple to assemble in terms of amount of exotic pieces, tools, etc. The entire assembly of the machine requires only 2 screw types: the standard 2 mm and a bulk order of 6-32 x 1-1/4 screws. These screws are actually interchangeable if the printed hole size and length of the bores are taken into account. The wooden pieces do not need to be laser cut; they can be fabricated with ease using only a pencil, ruler, and hand (or jig) saw.
The frame itself is made up of 6 different cut wood pieces: 3 base pieces and 3 towers. the lower two bases sandwich the nema 17 motors that drive the leadscrews and house the (optional) 20x4 lcd monitor. these bases are held in place with 3 "C" shaped brackets and 12 screws. 3 motor mounts hold the motors to the lower base, each using 4 customary bolts to hold the bottom down and the 4 metric bolts to secure the motor to the mounts.
The holes on the side of each c bracket hold the towers themselves in place. each tower is side-mounted leaving extra room behind the carriage for assembly/tweaking. the motherboard is also mounted on one of the towers for ease of accessibility (it could fit underneath with the motors, but it would be too hard to get to when needed).
To mount the towers, drill 2 holes on each tower and insert 2 customary screws into them from the c-bracket. To add stability, an upper support brace was added at each corner to triangulate the screws and add rigidity.