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Home   Forums   Events Calendar   Sponsors   Support the RRLine   Guestbook   FAQ     Register Active Topics | Active Polls | Resources | Members | Online Users | Live Chat | Avatar Legend | Search | Statistics Photo Album | File Lister | File Library [ Active Members: 8 | Anonymous Members: 0 | Guests: 209 ]  [ Total: 217 ]  [ Newest Member: mm0047 ]  All Forums  Model Railroad Forums  Early Rail Forum  New source for 3D printed arch-bar trucks  New Topic |   Reply to Topic |  Author Topic   deemery Fireman Premium Member Posted - 03/26/2021 :  4:18:11 PM     https://3dptrain.com/Creator/zmw/ dave Modeling 1890s (because the voices in my head told me to) Country: USA | Posts: 8964 George D Moderator Premium Member Posted - 03/26/2021 :  4:22:18 PM     I've never dealt with any 3D items. How durable are they for this kind of application? George Fly Army Country: USA | Posts: 16931 Bernd Fireman Posted - 03/26/2021 :  6:54:36 PM       I wonder how many you'll break trying to get wheel sets into them with the those brake beams on the end. I wouldn't think they would spread to far. Of course it also depends on what kind of material they are made from. From my current foray into 3D printing I hear that the resin is brittle if exposed to UV light for any length of time. It be interesting to purchase a pair without wheels to test out the theory at what point they break. Bernd New York, Vermont & Northern Rwy. - Route of the Black Diamonds Country: USA | Posts: 3993 railman28 Fireman Posted - 03/26/2021 :  7:51:06 PM     quote: Originally posted by George D How durable are they? They are fine. I mean they are strong enough. I find them stronger than the 0ld Red Ball cast metal versions offered by others. Only problem is their lightness. My experiences are with those printed by Shapeways and not this shops products. Bob It's only make-believe Edited by - railman28 on 03/26/2021 7:52:50 PM Country: USA | Posts: 5817 CNE1899 Engine Wiper Supporting Member Posted - 03/26/2021 :  7:53:08 PM     I work at a product design firm. We have two SLA machines and a FDM machine. For the SLA machines which use a laser to cure the resin, we have about 8-10 different types of resin. Some resins are flexible to simulate rubber, some are more rigid like glass filled nylon. So really it depends on the type of resin they are using. We have resins that are very durable, you can throw them against the wall and they won't break. I recently grew some Z scale tender tops out of three different resins. They are most likely using a durable resin, but you can always ask, and then look up the resin. Scott Edited by - CNE1899 on 03/26/2021 7:58:39 PM Country: | Posts: 290 Early1905 New Hire Posted - 03/26/2021 :  8:09:07 PM       They look interesting Just ordered 3 of each of the HO archbars. Howard Garner Country: USA | Posts: 21 railman28 Fireman Posted - 03/26/2021 :  9:00:16 PM     quote: Originally posted by CNE1899 Can a moderator remove these extras? Scott You Can. IN the list of Icons above YOUR post the last one is to remove the post. Bob It's only make-believe Country: USA | Posts: 5817 CNE1899 Engine Wiper Supporting Member Posted - 03/26/2021 :  9:10:16 PM     Thanks Bob. Scott Country: | Posts: 290 dave1905 Fireman Posted - 03/26/2021 :  11:36:26 PM       If you file a small notch in the bottom of the journal box on one side, just enough to relieve the amount the trucks have to spread, it makes installing wheelsets much less prone to breakage. Dave Husman Iron Men and wooden cars Visit my website : www.wnbranch.com Country: USA | Posts: 1203 Bernd Fireman Posted - 03/27/2021 :  5:17:20 PM       quote: Originally posted by dave1905 If you file a small notch in the bottom of the journal box on one side, just enough to relieve the amount the trucks have to spread, it makes installing wheelsets much less prone to breakage. Never thought of that. Thanks Dave. Bernd New York, Vermont & Northern Rwy. - Route of the Black Diamonds Country: USA | Posts: 3993 Tintic Range Section Hand Posted - 04/05/2021 :  3:55:45 PM     You don't need to file any notches in these. I took the product photos that are on the website. There is plenty of physical tolerance and flexibility in the material to allow wheelsets such as Kadee, Intermountain (what is depicted in the photo) and ExactRail to simply slide in place. Many UV-cured resins used in hobby applications now behave like normal polystyrene plastic. I've used 3D printed trucks from several sources, including a few shapeways sellers, and only broken one, even with the simulated body-mounted brake beams. In the case of the one that broke, that was not due to deficiencies in the material nor design but rather simply my fat fingers putting too much pressure on it while making a modification to match a specific prototype. 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