I am sorry to hear of the problems you have experienced with your HP Latex 260.
With the HP Latex machines, printhead longevity is affected by many variables and it is important that everything be set-up properly in order to maximize usage from thermal printheads. First, be sure to upgrade the printer firmware to the current version. As of today, that is SP_12.0.0.5 for the Latex 260.
Next, make sure that the Elevation Setting is set correctly for your printer. Medellin Columbia is at about 5000 foot elevation (1,500 meters). There is a setting in the firmware for elevation that you want to verify is set appropriately for your city's elevation (I believe the setting range is 3000-6000 feet).
Finally, set the printer's sleep timeout to 120 minutes - it defaults to a much shorter time, usually less than 30 minutes.
The printer should not be powered on and off on a daily basis, it is better to leave it on 24 hours per day and let it go to sleep when not in use for a lengthy period of time. Powering the printer on and off frequently can cause printhead failure.
Head Strikes with media or edge clips will damage printheads, so they should be avoided. One way to do this is to use the Manual Load option when loading media. Using this procedure, the printer will prompt the user to lift the blue lever and manually feed the media so that the leading edge is exiting the curing unit. Using this procedure ensures that the media will not hang up as it passes through the media path, and it tends to result in significantly fewer head strikes. I do not care for the Edge Clips on the L2 series, so I would discourage their use on L2 machines.
The printheads are a consumable item with HP Latex, and the heads are warranted separately from the printer. I don't know about Columbia, but in the USA, heads run $100 - $120 USD ea. It is considered a good practice to carry spares on the shelf at all times. This is to ensure your productivity when heads need replacement. Heads that need replacement before 1 liter (1000 ml) have passed through them are warranty-based replacement (HP replaces at no cost, including shipping).
The printer warm-up time and overall print throughput for the L2 machines have been significantly improved with the third generation Latex 300 units which began shipping May 2014.