MF-01X Mid motor mod
Description
NOTE: This model is a prototype. I tried to catch as many issues as possible, the model works for me, but there might be other issues. Any feedback will be appreciated and found issues will be fixed in next version. More detailed assembly manual and photos will be added later. This is little project that was in my mind since introduction of Tamiya's MF01X chassis. The chassis is versatile M-chassis, spiritual succesor of TL-01 with several flaws of the original fixed. But for some reason, Tamiya decided to put its motor high behind the rear axle, creating undesirable weight distribution (especially with light lipo batteries). Also, its gearing might be suitable for Jimny/Mercedes offroad models, but not really for rally Escort/Beetle ones. So, I decided to fix that. The design had two targets: it should look like a Tamiya part and use as few extra non-printed parts as possible. I also didn't want to include custom gears, as they add complexity to printing. Additional gears from Tamiya M-05 allowed me to cover gearing ranges of both TL-01 and Tamiya M-05 chassis. Parts needed for completion: 1x Tamiya M-chassis gear set (50794 or 54277) 1x 5x40mm gear shaft (13550027) 2x 3x10mm M3 screw for motor mount 1x 3x6mm M3 screw 1x 3x6mm M3 countersunk screw 2x 5x10x4 ball bearing 1x 5x8x2.5 ball bearing - in case you use 54643 ball bearing set - replaces one flanged bearing PRINTING I printed the parts on flat glass with 3mm brim. Textured print surfaces might introduce inaccuracy in height. Motor mount should be printed from ABS/ASA or atleast PETG. The rest can be printed from PETG or PLA+. The model is designed to be printed with 0.2mm layer height, 0.4mm nozzle and 3 perimeters. Lefthalf and Righthalf models include sacrificial bridges and supports to eliminate need for generated supports. However, height modifiers are needed to create 0.1mm gap between support and model: Righthalf: 7.2-7.4 mm 10.8-11 mm 18-18.2 mm Lefthalf: 11.2-11.4mm 20.4-20.6mm 26.4-26.6mm After printing, post processing will be needed to remove bridges. Redrilling screw holes to 2.6mm (threads) and 3mm for suspension arm mounts will be needed. Finally, the stock shaft needs to be shortened by 3mm - all you need is to drill new hole for the cross pin - bevel cover allows the excess part of the shaft poke through, so it doesn't need to be cut.
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