Mendel vitamin-less Y-carriage
by Wired1, published
In the spririt of the original Darwin this is a Y-carriage that uses virtually no vitamins other than two threaded rods and some machine screws.
The rods are just off-cuts from the lengths you use to build your printer so they won't even cost you anything.
Designed to take a standard Prusa-200x200 pcb-type hot bed which mount at 210mm centres (these heaters are cool at the corners so will be fine with a PLA printed carriage).
Utilises four of my unbreakable LM8UU bearing holders.
For 5mm threaded rods use the version "YCMax3_5mm".
Print out two ends YCMax3.STL plus four bearing holders LM8UUB.STL
2 perimeters, 2 base layers, 25% fill.
This has been designed to the maximum printable size and just fits on a 200x200 printer bed. Use a skirt 2mm away and it will fit with 45 degrees rotation.
2 x 150mm long 8mm rods (or 6" of equivalent imperial rod)
4 x M8 nuts
4 x 8mm washers
12 x M3x20 machine screws
4 x M3x25 machine screws (for bearing holders)
16 x M3 nuts
4 x LM8UU bearings
Mount the four bearing holders, two per carriage half, with 2 x M3x20 machine screws and nuts. The M3 screws can be used either way around but I went for the nuts on top to save having to trim the screws to fit.
Mount the belt clamps with 2 x M3x20 machins screws and nuts each.
Fit one LM8UU bearing per bearing holder and secure in position with an M3x25 machine screw and M3 nut.
Bolt the two halves together and space them to give an overall measurement of 210mm between pcb heater mounting holes (it is easier to set this up finger-tight then mount it on the y-rails before final tightening).
Install the carriage on the Y-axis rails and then systematically tighten the M8 nuts checking for easy movement as you go.