Plasty Mladeč narrow filament spool center
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Narrower (60mm) filament spool center for Plasty Mladeč (PM) 1kg filament spools
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Updated at source:
Model information
- Source
- Printables
- Category
- Accessories
- License
- Creative Commons — Attribution
Motivation
I had a couple of empty 1kg spools from Plasty Mladeč laying around that I could no longer use for 3D printing, those are too wide (~90mm) and don't fit in either my printer enclosure spool holder or filament dryer.
So I decided to break one apart, measure the center part and make it ~20mm narrower, so that I could transfer filaments from larger less expensive 2kg+ spools and use PM spools once again. And, of course, practice my OpenSCAD skills.
Model Files
There are two pre-rendered files: plasty-mladec-spool-center.stl and plasty-mladec-spool-center-split.stl. The difference in them except for the obvious “split” meaning cut in half is that the non-split version has chamfered inner edges.
It makes sense to use the split version if printing using a filament with high warping like ABS or ASA and glue the two halves. The chamfer would decrease the contact area with the build plate, so it got removed.
For PLA and PETG one can use the non-split version. I observed practically no warping with them.
Source Files and Customization
The OpenSCAD source file is attached as well. In theory one can make a center part of arbitrary width, even larger than the 80mm that comes in standard.
Main customization variables are:
| Name | Default value | Description |
| height | 60 | center part height, in mm |
| chamfer | false | whether to chamfer the inner edge of the center part |
| cut_in_half | true | whether to cut the part in half |
| cut_overlap | 5 | overlapping join height of the two cut parts, in mm |
| overlap_tolerance | 0.2 | overlapping join diameter tolerance, in mm |
Printing and Assembly
I printed mine from Spectrum ASA 275 using 0.3mm layer height without supports with 5mm inner and outer brims using the split STL.
After removing the brims the two parts were joined using ASA dissolved in acetone and let dry.
To replace the original center part get a larger flathead screwdriver and carefully pry the side parts off. Then slide the replacement part onto the side parts until it snaps in place.