[Prusa Core One] Prints fail mid way - Assembly and first prints troubleshooting

RE: Prints fail mid way

sinnok_prusa — Mon, 05 Jan 2026 17:20:36 +0000

thanks so much ! I will try that and get back to this thread with my results

RE: Prints fail mid way

miroslav.h4 — Mon, 05 Jan 2026 15:12:16 +0000

Such parts are never, I repeat never printed all at once together. If the print fails, you lose everything. And those "connectors" are unnecessarily long, a few mm are enough to fit correctly, everything else must be secured by glue. And it is even better to do the division in a modeling program and make those "connectors" as holes in both parts along the entire height and insert metal pins and glue. The part printed in this way will not be very strong without those reinforcing pins. And if you have to cut in the slicer, use the Dowel option. This will create holes in both parts and you can insert metal pins and glue them. Otherwise, everything that was said by my predecessor applies.

Diem — Mon, 05 Jan 2026 12:32:33 +0000

I suspect you have two factors interacting here; your filament is probably damp and will benefit greatly from drying and you are using grid infill which, with the damp stringing, has caused a head crash and a slight layer shift.

Dry your filament, change to cubic infill — and you may then encounter a third, unrelated issue: Your part is not going to be very strong in that orientation, if the load is light it might be usable but I would be inclined to replace the 'dowels' with more keyways and use CF or metal rods to join them.

Cheerio,

Prints fail mid way

sinnok_prusa — Mon, 05 Jan 2026 06:43:30 +0000

I'm very new to 3D printing and recently got a Prusa Core One. I've been trying to print a filament rack a number of times now, but faced failed prints every single time. I made sure the print sheet is clean - cleaned it with Isopropyl 99.9% and with soap and water, and I also tried using adhesive as well just in case. I'm pretty sure it is not slipping or getting detached. My printer came assembled from the manufacturer. I've had a few successful prints of random stuff which were smaller and less complicated I guess. It always starts fine then messes up after an hour or more...

I have also made sure that "Avoid crossing perimeters" is disabled and that "Steeper ramp before obstacles" is enabled following this post recommendation.

Below is an example of the failed print

Below is the slicer screenshot of what i'm trying to print (a rack bottom that is cut in half due to length in prusa slicer and with added connectors for re-attachment)

Many thanks for any help you can provide !