Haydn Huntley created a new version of the carriage and has been kind enough to publish it. Please check out his carriage at:
For the original carriage design that used cheap nylon rollers:
Note, his is meant for the Grabber rollers or the Delta Printer rollers.
At some point, I'll make a prime line version and repost here.
Temporarily removing the files as I have been notified and confirmed that there is an offset in the bolt mount holes, which will result in a tilt to the carriage when installed. :( Will repost once I have a new file that doesn't have that issue.
I really liked ElectronicHacks' "Kossel Mini Prime Line Roller Carriage"! The use of the low cost nylon prime line rollers is awesome!
However, I found that when I printed them straight up, there was some slack, even after fully tightening. To the point I needed to file away some material to get it to latch onto the HFS3-1515 aluminum extrusions. So after the 2nd one, I remade the model from ElectronicHacks' Sketchup file and removed some material so that the compression arm can come in another 1mm.
This is a vertical motion carriage for HFS3-1515 aluminum extrusions like those sold by Misumi.
I've included both the modified SketchUp file (forgot the extension) and the exported STL file.
For printing, I sliced the STL file in Kisslicer, though any slicer should work fine.
PrintrBot Simple V2 Print settings:
- 1.75mm PLA
- UBIS ceramic hot end 1.75mm @ 215 celsius
- Ceramic tile + painters tape print bed
- 20-40mm/sec perimeter and fill speeds.
- .2032mm layer heights (I'm using 1/4-20 threaded rod)
- 215 degrees celsius print temp (PLA)
- 0.8mm wall thickness
- 33.3% infill
- 2.5mm Hex Allen Wrench (will fit the M3 hex socket)
- M3 hex socket tool (like that used with Makerbeam/etc.) Should be deep enough to handle M3-20 bolts.
- Needle nose pliers, for the square nuts.
Assembly was done with the following parts:
- 3 x Prime Line Nylon Rollers (they come in boxes of 2 or 4)(M-6153 Prime-Line Nylon Rollers)
- 3 x M3-20mm hex socket head bolts.
- 3 x M3 sqaure nuts
- 3 x M3 locking nuts with nylon
- 1 x M3-10mm hex socket head bolt
- Print the carriage
- Thread the M3-20(s) through the three roller mounting holes. The socket head should rest inside of the recess.
- Screw on the M3 square nut tightly.
- Slide the Nylon roller, nut side down. The edges of the nut will rest on the corners of the M3 square nut.
- Screw on the locking nut with nylon, tighten the whole stack.
- Repeat for the other two rollers.
The M3 socket tool and allen wrench will come in handy to tighten everything nicely.
The M3-10 will be threaded into the side to compress the arm and get the rollers to grab onto the HFS3-1515. I ream out the side hole with a narrow tipped scissor. A file, drill, or other similar tool would work to ream out the hole a bit to avoid splitting the print by forcing the bolt.
The unit should grip the HFS3-1515 nicely and still roll freely or with some friction, depending on the level of tightness.
The GT2 grip and other bits should be pulled from the original Mini Kossel files and are thus not included here.