I re-tweaked an existing design from the Prusa to fit the P3steel. I realized that some of the current designs for P3steel are not accurate (the lead screw circle and the 8 mm smooth rod circle were not co-linear in some of the designs).
I also reduced the gap in the belt tensioner piece to snugly hold 2 flange bearings (F623ZZ).
You don't need support to print these parts and the dimensions should be fairly snug to avoid any excess play. If some of the holes were a bit tight, just use a Drimel to adjust and re-size.
Please be aware (as shown in one of the pictures) that the distance between centers of two circles is : 17 mm. So, before printing, check on your Prusa or P3steel printer that the center distance between smooth rod and lead screw is also 17 mm.
The parts are printed from a new filament called: Innofil Pro1 (PLA).
Although i printed these parts in PLA its recommended to print all parts in either ABS or PETG to get more tensile strength.
Update: 25th Oct 2018. My previous PLA idler broke due to fatigue, i reprinted all parts in PETG and i highly recommend to do so.
The lead screw used is : Tr8x8 with a brass nut that you can find easily on ebay or aliexpress:
I also welcome any feed back :)