HO coupler box for HO wagons (as those based on OSTycoon's excellent design).

thingiverse

Users typically utilize Bachmann horn hook couplers. Opt for the built-in pin, albeit unreliable, or substitute it with a track nail lodged in a 1 mm hole firmly glued in place. The latter yields more satisfying results. The provided three files display subtle discrepancies. One of them is elevated, permitting effortless coupling without causing the pin to break off. If the decision is made to abandon the pin, employing the lower file allows for the coupler's seamless insertion, after which the track nail can secure it in its desired position. Prior to commencing any print runs, employ an Xacto knife to carefully trim the inner recesses of the box, thereby preventing unnecessary support generation. A judicious reduction should then be made on the open flange for enhanced printing accuracy. The presented design constitutes my maiden creation due to a pressing need for this item. I firmly anticipate that knowledgeable members within this community can create superior work products that surpass my abilities. Inasmuch as electrical engineering may not have equipped me with sufficient mechanical skills, I take note of OSTycoon's commendable output in the field despite sharing an identical educational background as an EE.