At 10rpm, PLA should be fine, the rollers won't be moving that quickly. You must use grease on the moving parts as the friction between PLA surfaces tends to be quite high. Silicone grease would be good for this, ( or the green grease that Ulitmaker uses ).
What motor will you be using, make sure that doesn't get hot? I use nylon washers between the motor and mount on my pumps, acting as thermal breaks.
ABS would be a better material but it can be a sod to print.
ColorfabbXT may be a good alternative. Its easier to print than abs.
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