This is my self designed Railholder for wall mount. First design first try. The Maerklin K Track is 3 cm wide ( overall ) so i added 2 cm at the wall ( till the vertical bar ) and opposite 1.5 cm for clearance. The width of the holder is 1 cm with a hole exact centered to mount the track. This is for show purpose in my flat. I want to show my trains running and not get rusty in my separate room. This is a single Track version. Dual Track will come and bridge kits also. The Bridge Modules will be fitted to the correct Tracks. so You only need Print and plug and forget. ^.^ I love my railroad. Printed on Makerbot dual. Quality Setting LOW PLA: 210 °C - 230°C, 90mm / 150mm (Heated Bed 50°C) against warping 20% infill 0.2mm layer easy Print.