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On my machine (Minimax Lab 300) the rollers are 4.5" apart, which means I can feed through anything longer than 5" or so. The trick with short pieces is to feed them one after the other, butted up, without a break. This means the rollers are always engaged.A small piece on its own gets nudged as it butts up to the outfeed roller and gets nudged again as it leaves the infeed roller, as it drops down behind it. This can be what sets it off line and makes it difficult.The OP's 6 to 9" pieces shouldn't be a problem at 7mm, unless the rollers are much further apart than say 5". The ends need to be fairly squared off so that each piece butts up to the next one as you feed them through.So check the rollers - I doubt they'd be anything like the guessed 18" apart.
On my machine (Minimax Lab 300) the rollers are 4.5" apart, which means I can feed through anything longer than 5" or so. The trick with short pieces is to feed them one after the other, butted up, without a break. This means the rollers are always engaged.
A small piece on its own gets nudged as it butts up to the outfeed roller and gets nudged again as it leaves the infeed roller, as it drops down behind it. This can be what sets it off line and makes it difficult.
The OP's 6 to 9" pieces shouldn't be a problem at 7mm, unless the rollers are much further apart than say 5". The ends need to be fairly squared off so that each piece butts up to the next one as you feed them through.
So check the rollers - I doubt they'd be anything like the guessed 18" apart.