Difficulty
Easy
Steps
8
Time Required
00:45:00
- Carriage Assembly 8 steps
User-Contributed Guide
This guide is not managed by the site's staff.
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The carriage pack is #70849
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Its contents are individually bagged as shown.
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Most of the hardware will be used during this build, pieces that are not, should be placed somewhere safe for installation later, during final assembly of your printer.
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Locate the (12) R4 bearings and (24) black bearing covers.
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Start by laying a sleeve half on the table, face up. Set an R4 bearing into it and firmly press it into place.
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Set another sleeve half on the table and press the R4 bearing and sleeve into the new sleeve half to complete the carriage wheel.
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Note that the sleeves have a sharp edge to them where they were cut free from the bulk stock during manufacture. Take special care not to injure yourself on this edge. It can easily be removed with a razor knife if you so choose.
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Complete this process for all 12 of the supplied bearings.
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If you have the newer style of Spring Arms (implemented summer of 2018) skip to the next step!
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The spring arms consist of an inner and outer halves that retain two of the R4 bearing rollers you assembled in Step #2.
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Set two R4 bearings on the inner spring arm as shown in photo #2.
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Press fit the outer spring arm on to the two small posts protruding from the inner spring arm. The fit is very tight, but they will fit!
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In order to fully seat the pins once they're started in the holes, you can tap them in using the back end of your screwdriver as a hammer.
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Assemble three complete sets.
With the Rostock Max v4 it seems like you are supposed to use two screws in each of the spring arm assemblies.
Also - once both halves are together - use the vice again to pull the halves together and set both bearings in the arm all the way down. Worked beautifully.
If you have a flat/smooth faced vice it works pretty well to get these on. Slowly, but it easily gets the arm through the bearing and flush with the black rim.
It appears that the inner and outer spring arms are no longer how it is. Both halves are identical with a bearing going on each half, then fitting the two together. The bearing fitting is VERY tight and I’m hesitant to hammer them on to the post.
The above comments where very helpful. I also found that I needed to use a small file to remove flash around the very tip of each post in order to start the posts into the holes. If you do that, be careful not to remove any more than the flash.
to amplify Hansel's comment, note that arm with the hole all the way through is not symmetrical. in needs to be assembled so that the slightly taller hub is next to the bearing. Otherwise, the bearing will rub on the side of the hub support when assembled. Be sure you get this figured out before you assemble because it can be very hard to get the pieces back apart if you do it wrong. The insert posts will break if you are not careful.
Notice there is an inside and outside to the outer spring arm. Mine has holes all the way through and can be assembled the wrong way.
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The newer style of spring arms use two identical arms and two screws for assembly.
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Press the bearings on to the post of either spring arm, as shown in the second photo.
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Use the supplied 30249 #4 x 1/2" Philips Pan Head sheet metal screws in both sides of the spring arms to secure the bearings in place. Make sure there's no gap and the two halves are fully seated and screwed together.
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Repeat for all three spring arm assemblies.
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The remaining steps in this guide show photos of the older style of spring arm, but the orientation and installation is identical between the two styles. You can follow the rest of this guide normally.
Recommend fully seating the bearings onto the posts before screwing the parts together. Screwing the parts together will also fully seat the bearings, but will require a fair amount of torque on a Phillips head screw going into plastic, which is somewhat awkward to achieve.
I used a 1/4” 12-point socket, and Knipex pliers, as an improvised bearing press, and it required very little force. If you don’t have Knipex pliers yet, other smooth-jaw adjustable pliers might work, or use a rubber mallet or screwdriver handle to gently tap the 1/4” socket.
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Install two R4 bearing and a spring arm assembly on to an inner carriage half. Make sure you match the spring arm orientation as shown - installing it backwards can damage the spring arms!
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Install the outer carriage half. Ensure that the alignment pin in that carriage half inserts into the hole in the center of the spring arm.
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Assemble three complete sets.
I will reinforce the “Pay attention to the correct orientation of the spring arm.”. I didn’t and had to un-assemble them and turn them around on all three.
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Fix the outer carriage half with the inner carriage half using three #4 x 1/2" sheet metal screws in the locations indicated.
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Tighten these screws. Do not over-tighten! There is a deliberate 1mm reveal (gap) between the two carriage halves.
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Assemble three complete sets.
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Install the ball joint bars on the mounting pegs as shown.
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Use two #4 x 1/2" sheet metal screws and two #4 washers to secure the ball joint bar in place.
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Assemble three complete sets.
I didn’t find the ball joint bars in any other package in my kit. I’ll need these send out to me asap. Thanks.
Henry, this is not the place. This is the page to help update the documentation as part of the community. If you are missing parts, I encourage you to open a ticket at the following page:
D. Stark -
Looks like for the v4 you need to grab these from the arm pack
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Install the 4/40 3/4" flat head machine screw
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Stop turning the screw when you feel it has bottomed out! Don't crank it down or you'll strip the plastic!
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Assemble three complete sets.
Finally! all 3 are completed, even found all of the hardware.
Stef
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Cancel: I did not complete this guide.
39 other people completed this guide.
4 Comments
That’s it!? I still have a lot of components left in the bags I had to open to complete these three carriage assemblies.
A couple of things. All my parts were black. Just know you might get a different color, spent a few frantic moments looking everywhere in the box for blue parts. The little posts on the spring arm in step 3 that you press the other half of the spring arm over had a lot of plastic hanging off the sides. I trimmed that off with a pocket knife, otherwise it wouldn’t fit. I don’t know if it is significant but the assembled spring arms themselves can fit two ways. Either with the holes in the spring arm assembly up or down. I matched what was in the picture for all three.
