A frame brace/support designed to give a single plate Prusa i3 extra stability and support at the join between the Y axis and the main frame plate.
The brace can be retro-fitted to existing printers with very little (if any) disassembly.
Note. This will not fully stabilise the top of the frame like a full box frame version but will add additional strength and support to the lower frame while removing some flex from the upper frame.
See Instructions for compatibility.
This brace is designed to fit a 6mm frame plate where the frame has a 2mm recess along the bottom edge (which I think is the standard prusa design). I also use the 4 holes along the bottom of the frame which I believe are intended for cable management(?) to secure the brace to the frame.
I also suggest drilling a further 4 holes in the frame to secure the brace a the top, the best way to do this is to fit the brace and secure with the 4 lower holes and then use the brace as a template for drilling the upper 4 holes.
Once fitted to the frame you clamp down onto the threaded rod with the bar clamps to complete the support. I suggest you connect the Y axis to the frame and align and tighten in the usual method before adding the braces.
Parts you will need (note pictures show different lengths than suggested below)...
2 of printed frame braces
4 of printed bar clamps
8 of M3 x 20 cap head screw
8 of M3 x 25 cap head screw
8 of M3 lock nut
8 of M3 full nut
16 of M3 washer