Bresser T-Rex Instruction Manual page 27

⑦ The next step goes to the installation of the spool holders. Install one on
each side. To install a spool holder, level it and insert the end into one of the
openings.
⑧ Turn down the spool holder to make the holder bottom cleave to the printer
back.
Please refer to the next page for the right
method of filament mounting.
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27