Pics not showing? I have queried a mfg (a decently prolific one too) in the past about creep properties with their engineering targeted materials and they simply replied 'sorry we don't have this data'. I suspect that's not the whole story but it's typical of material manufacturers to stick to saying only what they think is needed to sell their material, and then farm out the rest to end-user and sponsored research. Plastics is particularly a dark-arts central for this. Anyway, yeah I think you're going to struggle to reach your price point on filled nylon, asa or even petg locally. A possibility is that you can use sheet-metal to reinforce the slide structure - either inserts or crimping sheet around a print.